package com.tcxr.framework.system;

import java.util.Random;

/**
 * 随机值
 * @author zhaoxianglong
 *
 */
public class RandomSys {
	/**
	 * 得到一个4位的字符随机数字。
	 * @return
	 */
	public static String getRandomNumber()
	{
		String [] valueList={"0","1","2","3","4","5","6","7","8","9",
				"a","b","c","d","e","f","g","h","i","j","k",
				"l","m","n","o","p","q","r","s","t","u","v",
				"w","x","y","z",
				"A","B","C","D","E","F","G","H","I","J","K",
				"L","M","N","O","P","Q","R","S","T","U","V",
				"W","X","Y","Z"};
		
	 String  value="";
	 int num=0;
		for (int i = 0; i <4; i++) 
		{
			 num=(new Random().nextInt(valueList.length));
			value+=valueList[num];
			
		}
		
	
		
		
		return value;
	}
public static void main(String[] args) {
	for (int i = 0; i < 100; i++) {
		System.out.println(getRandomNumber());
	}
	
}
	
	
	
}
